Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
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Volume 56, Issue 11
Displaying 51-63 of 63 articles from this issue
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  • Competition between the Néel and the Effective Singlet States in Spin-1/2 Alternating Heisenberg-Ising Antiferromagnet in One Dimension
    Hidetoshi Nishimori, Kiyomi Okamoto, Masayuki Yokozawa
    1987 Volume 56 Issue 11 Pages 4126-4133
    Published: November 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.4126
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    The ground-state properties of the one-dimensional spin-1/2 alternating Heisenberg-Ising antiferromagnet are studied both analytically and numerically. The phase diagram is qualitatively predicted by the use of the phase Hamiltonian: The ground state is either the Néel or the effective singlet state according to the values of the alternation and anisotropy parameters. The phase transition between these states is of the first order. The ground state energy, its derivative with respect to the alternation parameter, excitation gap, and the various long-range order parameters are exactly calculated by the numerical method for finite systems (N≤20). The numerical calculations support the analytically predicted phase diagram. The correlation length is also numerically calculated at finite temperatures by the use of the quantum transfer-matrix method.
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  • Spin-Wave Instabilities by Perpendicular Pumping in K2CuF4
    Hitoshi Yamazaki
    1987 Volume 56 Issue 11 Pages 4134-4140
    Published: November 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.4134
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    The first-order Suhl instability in the two-dimensional ferromagnet K2CuF4 is investigated at the frequency of 8.9 GHz and at the temperature of 1.4 K. The spin-wave relaxation is derived from the threshold for spin-wave instability by the three-magnon splitting process which results in the annihilation of a k=0 magnon and the creation of a pair of magnons having wave vectors k and −k. Spin-wave linewidth in the [100] direction is very large compared with other directions in the c-plane.
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  • NMR Study of Transferred Hyperfine and Exchange Interactions in Ferromagnetic Semiconductor EuLiH3
    Kenichi Kojima, Tomoyuki Imai, Koichi Hiraoka, Tadamiki Hihara, Yoshit ...
    1987 Volume 56 Issue 11 Pages 4141-4149
    Published: November 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.4141
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    The zero field 153Eu, 3Li and 1H NMR in a cubic perovskite ferromagnet EuLiH3 (Tc=37 K) have been observed as functions of temperature and pressure. The 153Eu and 7Li NMR frequencies are 123.4 and 7.95 MHz at 4.2 K, respectively, corresponding to the effective fields Hi=−266.4 and +4.80 kOe, and a broad 1H NMR is observed in the frequency range between 20 and 46 MHz. The nearest neighbour exchange constant of J1=0.83 K is obtained by fitting 153ν(T) to the spin wave theory. The transferred hyperfine (thf) field at Eu nuclei is derived as H1=+5.2 kOe per n.n. Eu2+ ion by estimating the core polarization field from the hyperfine splitting of the Eu2+ ESR in diamagnetic SrLiH3. The pressure dependence of ∂Hi⁄∂P=0.246 kOe/kbar for 153Eu is attributed to an increase of H1 under pressure.
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  • Characteristic of Dielectric Behaviour of Ferroelectric Liquid Crystal at Smectic-A and Chiral Smectic-C Phase Transition
    Katsumi Yoshino, Kenji Nakao, Hiroki Taniguchi, Masanori Ozaki
    1987 Volume 56 Issue 11 Pages 4150-4156
    Published: November 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.4150
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    A sharp peak of dielectric constant which appears at the phase transition between chiral smectic-C and smectic-A phases is found to become clear under dc bias field and in thin cells in which the Goldstone mode originated from the fluctuation of azimuthal angle of molecular long axis corresponding to the winding and unwinding motions of helix characteristic to ferroelectric liquid crystal is suppressed.
    The temperature Tm where dielectric constant shows maximum is found to increase under dc bias field E corresponding to the field induced ferroelectric phase at higher temperature than T0 (Curie temperature under no bias field) with the relation of (Tm−T0)∝E2⁄3. The peak dielectric constant εp is also found to be suppressed with the dc bias field with the relation of εp∝E−2⁄3. The results clearly support that the phase transition of these compounds is of the second order.
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  • Luminescence of V-Type Centers in Potassium and Rubidium Iodide Crystals
    Tadahiko Harami, Shouhei Kakigi, Akizo Okuda
    1987 Volume 56 Issue 11 Pages 4157-4161
    Published: November 15, 1987
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.4157
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    Photoluminescence of V-type centers has been studied for KI and RbI crystals containing excess of iodine. Colored crystals were irradiated previously with V3 light at LNT to convert primary V centers into other V-type centers which induced absorption bands in the uv and the visible regions. It was found that when the samples are excited in one of absorption bands at LNT for KI and at 68 K for RbI, they exhibit two emission bands at 1540 and 1690 nm in KI; 1500 and 1630 nm in RbI, respectively. The excitation spectra consist of three bands at 350, 440 and 800 nm in KI; at 350, 445 and 800 nm in RbI, respectively. Separations of the two emission bands increase with increasing of temperature. In both iodides the luminescence is ascribed to transitions in the same type of trapped hole centers containing iodine atoms.
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  • Urbach Tail of Organic Dyes in Solution
    Shuichi Kinoshita, Nobuhiko Nishi, Akiya Saitoh, Takashi Kushida
    1987 Volume 56 Issue 11 Pages 4162-4175
    Published: November 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.4162
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    Emission excitation spectra have been measured in rhodamine 6G and tetracene in solutions at various temperatures in the low-energy side of the lowest absorption band. It has been found that the spectrum of rhodamine 6G is well approximated by a Gaussian convoluted by an exponential tail, while that of tetracene has shoulders in the nearly exponential tail. The temperature dependence of the low-energy tail of rhodamine 6G has been compared with that of the Urbach tail in solids. A long exponential-like tail has also been found in the emission spectrum of rhodamine 6G over ∼5000 cm−1 toward the low-energy side. From the analysis of the absorption, excitation and emission spectra, it is shown that both the molecular vibrational modes and the classical mode of the surroundings which has only quadratic interaction with the dye molecule contribute to these tails.
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  • Exciton Luminescence Band Associated with Emission of an Acoustical Phonon in Anthracene Crystals
    Yasuo Nozue, Miho Kawaharada, Takenari Goto
    1987 Volume 56 Issue 11 Pages 4176-4182
    Published: November 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.4176
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    A broad luminescence band appears just below the zero-phonon luminescence band of the exciton. It is found from an analysis of the reabsorption effect on the luminescence spectrum that the secondary distribution model of the polaritons is not applicable to this band. The spectral shape changes with varying the temperature between 1.8 and 4.2 K. The broad band is assigned to the sideband associated with emission of an acoustical phonon. The luminescence spectrum of the acoustical phonon sideband is calculated with taking account of the polariton effect. The calculated spectrum coincides with the experimental curve. The energy width of the spatial dispersion of the exciton is estimated to be 5±1 cm−1 for wave vector K perpendicular to the (001)-plane. The zero-phonon luminescence band is found to be influenced considerably by the reabsorption effect.
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  • EXAFS Study on Premartensitic Phase in Nb3Sn
    Hirofumi Sakashita, Kazuya Kamon, Hikaru Terauchi, Nagao Kamijo, Hiron ...
    1987 Volume 56 Issue 11 Pages 4183-4187
    Published: November 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.4183
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    Extended X-ray absorption fine structure measurements have been carried out near the K-edge of Nb3Sn in order to investigate the local structure of the martensitic and the premartensitic phases. The splitting of the first shell corresponding to the first neighbour Nb–Nb atoms into three shells has been observed in the premartensitic phase. This implies that the local distortion with the low temperature martensitic structure takes place in the cubic phase.
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  • Magnetohydrodynamic Stability of Spheromak Plasma in Toroidal Flux Conserver with Rectangular Cross Section III Stability for Symmetric Modes
    Shobu Kaneko, Yi Ping Wang, Hiroaki Tsutsui
    1987 Volume 56 Issue 11 Pages 4188-4189
    Published: November 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.4188
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  • The Field Dependence of Intensity of Neutron Scattering for a Tetrahedral Ion
    Yoshiaki Ozaki
    1987 Volume 56 Issue 11 Pages 4190-4191
    Published: November 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.4190
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  • X-Ray Diffraction Study on Successive Phase Transition [N(CH3)4]2NiCl4
    Hironobu Kasano, Hiroyuki Mashiyama
    1987 Volume 56 Issue 11 Pages 4192-4193
    Published: November 15, 1987
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.4192
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  • Decay Times of Intrinsic Luminescence in RbI
    Tokiko Ohata, Tetsusuke Hayashi, Shigeharu Koshino
    1987 Volume 56 Issue 11 Pages 4194-4195
    Published: November 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.4194
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  • Absorption Spectra of Amorphous and Crystalline SnTe Thin Films in the 2–120 eV Region
    Kazutoshi Fukui, Jun-ichiro Yamazaki, Tadaaki Saito, Shin-ichi Kondo, ...
    1987 Volume 56 Issue 11 Pages 4196-4197
    Published: November 15, 1987
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.4196
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